Apparatus for drilling and cutting



/n ven for: John A! Se/v/g Dec. 18 1923. J. N. SELVIG APPARATUS FOR DRILLING AND CUTTING Sheets-Sheet 2 March 22, 1920 /n vn for. John N Se/v'ig Dec. 18, 1923.

1,478fl68 J. N. SELVIG APPARATUS FOR DRILLING AND CUTTING Filed March 22 1920 3 Sheet-Sheet 5 w'wvv"! vmvw w Z Z a o a o o //7 van for. John /V. Se/v/g:

Patented Dec. 18, 1923.

pair STATES JOHN n. SELVIG, orv onroaeo; ILLINQISLASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OFNEW roan, Y., A ooaPoRA'rIoN or NEW YORK.

APPARATUS FOBDRILLING AND CUTTING."

Application filedMarc-h 22, 1920. Serial a0.- 3 7,727.

To all 1071 0027, it may concern:

it known that I, JOHN N. SELVIG, a subject of the King of Norway, residing at Chicago, in the county of Cook, State of Illinois, have invented certain'new and useful Improvements in Apparatus for Drilling and Cutting, of which the following is a full, clear, concise, and exactdescription.

This inven tionis particularly applicable to the manufacture of electrical insulating blocks drilled to receive attaching or other wires and cut from bars or strips after the drilling operation. The machine constituting the present embodiment of the invention is designed to prepare the lavite blocks used to connect the ends of a pair of plates and serve to support the; electric conductors in an audion' or vacuum tube. These blocks have perforations extending therethrough for the conductors. The object of my invention is toprovide a simple, convenient and rapid method and apparatus for first drilling such strips and then sawing them into the finished form. i

In the practice of my invention I prefer to employ an apparatus having a plurality of drills and cutting tools and a ,in which the strip of lavite is secured, said being adapted to cooperate with the drills for drilling the strip and also with the cutting tools for cutting the strip into blocks.

. To these and other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings, Fig. 1 is a plan view, partly in sectionyof a machine for drilling and cutting lavite strips constructed according to my invention; Fig. 2 is an enlarged section on line 2-2, Fig. 1. looking in the direction of the arrows; Fig. dis an enlarged section on line Fig. 1, looking in the direction of the arrows; Fig. l is a detail plan view showing the devices for moving the holder toward the drills; Fig. 5 is plan view of a in which the lavite strip is clamped; Fig. 6 is a. longitudinal section of the same; Fig. 7 is a section on the line Z''? of Fig. 6; Fig. 8 is a fragmentary planview partly in section of one side of the holder for thepjig V and showing the means for clamping the ig in the holder; Fig. 9 is a section on the line 9,- -9 8, looking in thedirection of the arrows; Fig. 10 is a section on the line1010 of Fig. 8 looking in the direction of the arrows; .Fig. 11 is a fragmentary view of the holder showing the jig clamped in position thereon; Fig. 12 is a section on line 12-12 of Fig. ll looking in the direction of the arrows; Fig. 13 is a detail view of one end of the jig; Fig. 14: is a perspective view of a laviteblock as it appears when drilled andcut from the strip, and Fig. 15 is a perspective view of a vacuum tube in which the lavite block is used,.;par t of said tube being broken away. to expose the interior.

My invention contemplates the provision of an apparatus for drilling a plurality of transverse perforations in a lavite strip, which is then cut into blocks 1, such as illustrated in Fig. 14 of the drawings. The blocks 1 are perforated through one of the longer dimensions as at 2, and also through the short dimension as at 3. The perfora tions 3 are arranged at substantiailyright angles to the perforations 2 and are offset therefrom so as notto intersectthem. These blocks vare used in vacuum tubes 4, such as illustrated in Fig. 1.5 of the drawings. in these tubes the. blocks 1 connect the ends of a pair ofplates 5 and support and insulate the electric conductors 6 :from wires located inthe perforations ,2 and 8. The blocks 1 are out from. an elongated strip of lavite 7 having a breadth and thickness corresponding to the required breadth and J thickness of the blocks .1. In the operations of drilling and cutting, the strips are secured in a jig or holder 8, best illustrated in Figs. 6 and 6. The 8 comprises an elongated rod or bar 9 having knurled finger-pieces 10 at its ends by which it can be conveniently handled. On one side of the jig the rod 9 is provided with a longitudinal slot or groove 11 of a depth somewhat greater than half the thickness of the rod and of a width corresponding to the width of the lavite strip. A bar 12 is pivoted to the rod 9 adjacent one end of the groove 11 and is adapted to swing about its pivot into the groove to engage the lavite strip in the groove. The opposite end of the bar 12 is forked at 13, and cooperateswith a latch 14 pivotally mounted in the. groove 11.. The latch 14 swings freely in the groove 11 andcomprises a keeper in the form, of a thumb nut threaded onto its outer end. The nut 15 is adjustable to hold the bar 12 in clamping engagement with the lavite strip in the groove 11. '8

c If desired, the bar 12 may be provided with a finger piece 16for convenience in swinging the bar 12 into and out of its groove. The rod 9 is provided with a plurality or series of perforations 17 arranged longitudinally thereof, spaced equidistantly from each other and intersecting that part of the groove 11 which is occupied by the lavite strip. The rod 9 is also provided with a second series of perforations 18 arranged longitudinally of the red at substantially right angles to the perforations 17. The perforations 18 arespaced similar to the spacing of the perforations 17 and are offset therefrom as shown in the drawings so that the two series of'perforations do not intersect eaoh other. The perforations 18 communicate with the bottom of the slot 11 and thebar 12 is provided with a longitudinal groove 19 opposed thereto. The bar 9 is also provided. with a plurality of traverse slots 20 in the side opposite the groove 11 which they intersect fora distance somewhat greater than the thickness of the workpiece ofstrip .7. The slots 20correspond in number and spacing to the perforations 17 and 18 and are arranged between them. The jig 18 is adapted to cooperate with a drilling apparatusin which the drillsor tools" cooperate with the perforations 17 and 18 to engage and drill a workpiece ,in the slot 11. 'The jig is also adapted to cooperate with a cutting apparatus in which the cutting tools or saws cooperate with the slots 20 to engage and cut the workpiece. If desired, the bar 12 may be provided with grooves or slots 21 extending transversely of the bar along its inner side and provide a clearance space for the saws opposite the slots 20. c

A- drillingapparatus particularly adapted for my purpose is clearlyillustrated in Figs. 1', 2 and4 of the drawings andcomprises a base or support 22 in the rear partof which is formed a bearing for a drive shaft 23 to the end of which is secured a pulley 24, a belt 25 connects the pulley'24 with a pulley 26 on the main shaft of a motor 27 by which the shaft 23. is driven. Rotatably mounted in hearings in the rear of the base and extending over the driven shaft 23 at substantially right angles thereto, area plurality of drill spindles 28. The drill spindles 28 extend forwardly and rearwardly of the machine, substantially parallel with each other, and at their forward ends are provided with means for supporting the work tools or drills 29. Adjacent the main shaft 23 the drill spindles 28 are provided with worm gears 30 which are 'operatively engaged by gears 31 fixed to the shaft 23. The drills 29 are arranged in alignment laterally of the 'machine and spaced apart from each other a distance twice the distance between the perforations 17 or 18 formed in the jig. With this arrangement it is apparent that there are twiceas many perforations 17 or 18 in the jig as there are drills 29, and that the drills cooperate with alternate perforations at one time. Means are provided for supporting the jig in the apparatus and moving it toward and from the drills 29, said meanscomprising a carrier 32 movably mounted on a pair of supporting bars 33 and 34'l orizontally supported in the frame 22. Thebars 33'and 34 are substantially parallel with each other and at their forward ends are supported in the-bosses 35 and 36. The ends of the carrier 32 are provided with sleeves 37 and 38 by which the carrier is slidably mounted on the'bars. Springs 9 and 40 are coiled about the bars 33 and 34 and serve to yieldingly hold the carrier in retracted position. Springs 41 and 42 are also coiled about the bars 33'and 34 forwardly of the carrier and serve to cushion the return movement of the carrier. Mounted on a shouldered headed screw or bolt 43 secured'to the frame 22 is a cam 44 having a plurality of lobes 45, 46, 47 48, 49 and 50.

The cam is rotatably mounted on the bolt and each of the lobes is formed with an abrupt shoulder 51 and a curved shoulder 52. Thedistance of the outer edge of the earn from its center increases continuously from the shortest lobe to the longest lobe 50. Means'are provided for imparting a stepbystep movement to the cam. Said meanscomprises a ratchet 53 fixed to the cam or formed integral therewith and rotate able on'the bolt 43. The ratchet 53 is provided with a plurality of teeth 54 corresponding'in number and arrangement with the lobes of the cam. An arm or lever 55 havinga handle or finger-piece 56 is pivotally mounted on the bolt 43 and has a pawl 57 adapted to engage theteeth of the ratchet, a spring 58 mounted onthe arm 55 engages the pawl and holds it yieldingly in engagement with the ratchet. The cam 44 is mounted in position to engage a stud or projection in the form of a headed screw 59 on the carrier,which is held yieldingly in engagement with the cam'by the springs 39 and 40. At its ends the carrier is provided with the yokes 60 and 61, in which the jig is supported in a horizontal position directly in front of the drills, and the yoke 61' is A rovided with means for clamping the jig in the carrier. Said means comprises a clamping member in the form of a resilient finger 62 formed integral with the yoke and between which and the upright member 63 of the yoke the jig is adapted to beclamped. The

finger 62 is cut from the material of the upright member 64 which is tapped to receive a set screw 65 the-inner end of which engages the finger 62 and is adapted to spring said finger into clamping engagement with the jig in the yoke. F or the purpose of aligning the perforations 18 with the drills 29, the jig is provided with an elongated recess 66 adjacent its end. The ends of this slot cooperate with a stud or projection 67 in the yoke 61, and serves to align the perforations 18 with the drills. When the stud cooperates with one end of the slot the drills cooperate with the alternate perforations 18, and when at the other end of the slot, the drills cooperate with the remainder of the perforations 18. In order to align the perforations 17 with the drills, the jig is provided with the elongated grooves 68 and 69, also adapted to cooperate with the stud or projection 67, the grooves 68 and 69 are offset longitudinally of the with respect to the groove 66 to allow for the offset position of the perfo ations 18 with respect to the position of the perforations 17. The drilling operations are performed as follows: The lavite strip is clamped in the which is then placed in the carrier 61 with the projection 67 adjacent one end of the slot 66 of the The jig is then clamped in the carrier by means of a set screw 65. When the jig is placed in the carrier the cam n is atjusted with the shortest lobe 45 in position to enthe stud 59 on the carrier. The arm 55 is now manipulated to rotate the cam step by step which causes the lobes to successively engage the stud 59 to move the carrier toward the drills and press them into engagement with the workpiece. As each lens of the cam moves off the stud 59, the springs retract the carrier and the stud enters the depressions between the adjacent lobes and relieves the drills from the workpiece. One complete rotation of the cam 4-4.- moves the workpiece forwardly a distance sufficient to drill completely through the shorter dimension of the workpiece. In order to advise the operator when the cam has made a com plete rotation, I provide an indicator in the form of an alarm or bell 70 mounted on the frame of the machine. A clapper in the form of a lever 71 is pivoted on the frame of the machine and has one end in position to engage the bell and the other end e; :ends beneath the cam a l which has a projection 72 adapted to engage and retract the lever 71 once during each revolution of the cam. When the revolution of the cam is complete, the projection 72 rides off the end of the lever 71 and a spring 73 which is coiled about the pivot of the lever 71 swings the clapper into engagement with the bell and sounds an alarm.

As above explained, only half of the perforations 18are drilled at one operation. To complete the drilling thereof, the is moved laterally until the stud 67 engages the other end of the slot 66 which aligns the remainder of the perforations 18 with the drills and the operation is repeated. The jig is then turned through an angle of substantially ninety degrees and the operation repeated with the stud 67 in engagement with the ends of the groove 69 to drill the perforations 17. At one operation the perforations 17 are drilled substantially half way through the workpiece during a complete rotation of the cam. To complete the drilling of these perforations the jig is again placed in the carrier in reversed position with the stud 67 in engagement with the groove 68 and the operation repeated to complete the drilling of the perforations 17, this time from the opposite side of the When the perforations 17 and 18 have been drilled, the jig with the workpiece is removed from the drilling machine and placed in the cutting machine. The latter 'comprises a plurality of cutting tools 7 5, spaced equidistantly from each other on a horizontal shaft 76 having a bearing in a base or support 77. One end of the shaft 76 has a pulley 77 connected by the belt 78 with a pulley 79 on the shaft of the motor 27 by which the cutting tools are operated. As illustrated, the cutting tools may be provided with saw teeth and are spaced on the shaft to correspond with the spacing of the slots 20 in the jig. 1i. holder or carrier 80 for the jig is mounted in the frame 77 and adapted to have a limited swinging move ment therein. The holder 80 comprises a rod or shaft 81 having bearings in the frame 77 and having the arms 82 keyed or otherwise screwed thereto. The arms 82 extend upwardly and forwardly to a point in front of the cutting tools and at their upper ends are provided with yokes 83 in which the ig is carried and held by gravity. An arm 8% is secured to the shaft 81 adjacent its right hand end and has aknob orhandle 85 at its end by which the holder is moved to swing the jig into engagement with the cutting tools 75, to cut the workpiece into blocks. The arm 84: is provided with adjustable means in the form of a bolt 86 adapted to engage a fixed stop 8'? to limit the movement of the holder in the direction of the cutting tools, and a fixed stop 88 to limit the movement of the carrier in the opposite direction. The cutting operation is performed follows: The jig with the drilled workpiece in position therein is placed in the yokes 83 of the holder 80 with the slots 20 in position to register with the cutting tools 75. The arm Set is then moved forwardly carrying the workpiece into engagen'ient with the cutting tools. As soon as the tools have cut through the workpiece the end of the bolt 86 engages the stop 87 and prevents further forward movement of the holder. The

from the holder.

holder is then retracted and the jig removed By disengaging the latch 14 from the bar 12 the finished blocks 1 may be now removed from the jig.

What I claim is: I

1. In an apparatus for drilling strips or bars, the combination of a plurality of drills, means for rotating said drills, a movable holder adapted to carry a workpiece, a rotatable cam adapted to move said holderto press the workpiece into cooperation with the drills, and means for imparting a step-by-step movement to the cam.

2. In an apparatus for drilling strips or bars, the combination of a plurality of drills, means for rotating said drills, a movable holder adapted to carry a workpiece, a rotatable cani having a plurality of lobes adapted to engage and move said holder to press the workpiece into cooperation with the drills, and means for imparting a step by-step movement to the cam.

3. In an apparatus for drilling strips or bars, the combination of a plurality of drills, means for rotating said drills, a movable holder adapted to carry a workpiece, a rotatable cam having a plurality of lobes adapted to engage and move said holder to press the workpiece into cooperation with the drills, a ratchet associated with said cam, and a hand actuated pawl cooperating with said ratchet to impart a step-by-step movement to the cam.

4. In an apparatus for drilling strips or bars, the combination of a plurality of drills, means for rotating said drills, a movable holder adapted to carry a workpiece, a rotatable cam adapted to engage and move said holder to press the strip into cooperation with the drills, means for rotating the cam, and means for indicating a complete rotation of the cam.

5. In an apparatus for drilling strips or bars, the combination of a plurality of drills, means for rotating said drills, a movable holder adapted to carry a workpiece, a rototable cam adapted to engage and move said holder to press the workpiece into cooperation with the drills, means for rotating the cam, and an alarm adapted to indicate a complete rotation of the cam.

6.-In an apparatus for drilling strips or bars, the combination of a plurality of rotating drills, a perforated jig adapted to hold a workpiece, a movable carrier, and means for clamping the jig in said carrier.

7. In an apparatus for drilling strips or bars, the combination of a plurality of rotating drills, a jig having two sets of sub stantially parallel perforations each set corresponding with said drills, a movable carrier for said jig, and cooperating means on the jig and carrier for locating the jig in such position that the drills cooperate with one set of perforations.

8. In an apparatus for drilling strips or bars, the combination of a plurality of ro tating drills, a movable carrier, a jig having two sets of substantially parallel perforations each set corresponding with said drills, means for securing the jig in two positions in said carrier in which firstone set of perforations and then the other is adapted to cooperate with the drills.

9. In an apparatus for drilling strips or bars, the combination of a plurality of rotating drills, a having two series of perforations at substantially right angles to each other and adapted to cooperate with said drills, a movable carrier, and means for securing the jig in said carrier in position with one series of perforations or the other in juxtaposition to thedrills.

10. In an apparatus for drilling strips or bars, the combination of a plurality of rotating drills, a carrier movable toward and from said drills, a plurality of revolving saws, a pivoted holder movable toward and from said saws, a adapt-ed to have a workpiece secured therein perforated to correspond to the drills and slotted to correspond to the saws, means for securing the ji in the carrier to move the workpiece into cooperation with the drills, means for positioning the jig in the holder to move the workpiece into cooperation with the saws, and a source of power for rotating the drills and revolving the saws.

11. A for a strip or bar adapted to cooperate with apparatus for drilling and cutting the strip and comprising an elongated rod having a longitudinal slot for the strip, a bar in the slot, and means for securing the bar in engagement with a strip in the slot.

12. A for a strip or bar adapted to co operate with apparatus for drilling and cutting the strip and comprising an elongated rod having a longitudinal slot for the strip, a bar pivoted to the rod and adapted to engage a strip in the slot, and a latch engaging the bar and adapted toclamp the strip to the rod in the slot.

13. A jig for a strip or bar adapted to cooperate with apparatus for drilling and cuttin the strip and comprising an elongated rod having a longitudinal slot for the strip and a series of perforations for the drills communicating with the bottom of the slot, and a bar for securing the strip in the slot.

14:. A jig for a strip or'bar adapted to cooperate with apparatus for drilling and cut ting the strip and comprising an elongated rod having a longitudinal slot for the strip and a series of perforations for the drills communicating with the bottom of the slot, and a bar for securing the strip in the slot and having a longitudinal slot opposed to said perforations.

15. A. jig for a strip or bar adapted to cooperate with apparatus for drilling and cutting the strip and comprising an elongated i rod having a longitudinal slot for the strip,

a plurality of transverse perforations intersecting the slot, a plurality of perforations arranged at substantially right angles to the first mentioned perforations offset therefrom and. communicating with said slot and a plurality of transverse slots intermediate said perforations and intersecting the longitudinal slot, and means for securing a strip in said longitudinal slot.

16. In an apparatus for drilling strips or bars, the combination of a plurality of drills, a carrier movable to and from said drills, a jig for a workpiece having a plurality of transverse perforations arranged longitudinally thereof, the alternate perforations adapted to cooperate with said drills simultaneously, and cooperating means on the jig and carrier for positioning the jig in two positions.

17. In an apparatus for drilling strips or bars, the combination of a plurality. of drills, a carrier movable to and from said drills, a jig for a workpiece having a plurality of transverse perforations arranged right angles to the first mentioned perforations, and means for securing the jig in the carrier in position to engage the drills with the first mentioned perforations from opposite sides of the jig or in position to engage the drills with the last mentioned perforations.

In witness whereof, I hereunto subscribe my name this 15th day of March A. D., 1920.

JOHN N. SELVIG. 

